5 Rocket Stocks to Buy This Week

These stocks have both short-term gain catalysts and longer-term growth potential.

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Satellite radio company Sirius XM Radio ( SIRI) has been benefitting from big tailwinds in new car sales. The one-two punch of record low interest rates and an older national car fleet than ever has given new auto sales a shot in the arm in the last couple of years -- and since SIRI's tuners come preinstalled in more than two-thirds of new vehicles, the firm is enjoying a key pipeline of new customers right now. That lead creation mechanism helped push Sirius XM over the 25 million subscriber hurdle this year.

SIRI's business isn't without competition. Increased in-car connectivity has opened the door for rivals like Pandora ( P) to take a piece of the pie. But Sirius XM gets the fact that content, not just accessibility, is key to keeping paying subscribers. By offering coveted content like Howard Stern and the NFL, as well as uncensored talk radio and curated specialty channels, the firm draws a bigger, more engaged crowd. And that keeps customer renewing.

For years, SIRI's huge fixed-cost structure has been its Achilles heel. But now that the profitability threshold has been taken out, investors should continue to warm to the firm's business model -- even if it can't keep up this growth pace forever.